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NRG 40C Anemometer

The 40C Anemometer offers field-proven measurement accuracy at an economical price.

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NRG 40C Anemometer | MEASNET Calibrated

#1900

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NRG 40C Anemometer | CPH MEASNET Calibrated

#4350

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The 40C was one of the first anemometers designed exclusively for the wind industry.

The 40C Anemometer has recorded wind speeds of 96 m/s (214 mph). Their bearings and low moment of inertia permit very rapid response to gusts and lulls. Due to their output linearity, these sensors are ideal for use with various data retrieval systems. A four-pole magnet induces a sine wave voltage into a coil, producing an output signal with frequency proportional to wind speed.

Constructed of rugged Lexan cups, the 40C is molded in one piece for repeatable performance. A rubber terminal boot is included with each anemometer for additional protection from the elements.

A MEASNET calibration certificate is available for each sensor: Download Calibration Report.

  NRG 40C Anemometer | MEASNET Calibrated (#1900) NRG 40C Anemometer | CPH MEASNET Calibrated (#4350)
Description  
Sensor type 3 Cup Anemometer 3 Cup Anemometer
Applications
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
Sensor range 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded) 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded)
Instrument compatibility All NRG loggers All NRG loggers
Output signal  
Signal type Low level AC sine wave, frequency linearly proportional to wind speed Low level AC sine wave, frequency linearly proportional to wind speed
Anemometer Transfer Function
  • Consensus Transfer Function:
    Scale Factor (Slope): 0.765 m/s/Hz (1.711 mph/Hz)
    Offset: 0.35 m/s (0.78 mph)
  • Refer to the white paper "The Maximum Type 40 Anemometer Calibration Project" for more information on the consensus transfer function
  • All NRG 40C Anemometers are calibrated per IEC 61400-12-1, Annex F
See individual calibration report
Output voltage at threshold 80 mV (peak-to-peak) minimum 80 mV (peak to peak) minimum
Output voltage at 60Hz
  • 12 V (peak-to-peak) typical
  • Output amplitude NOT proportional to wind speed
  • 12 V (peak-to-peak) typical
  • output amplitude NOT proportional to wind speed
Calibration Each anemometer individually calibrated, calibration reports provided via electronic download Each anemometer individually calibrated, calibration reports provided via electronic download
Output signal range 0 Hz to 125 Hz (at 96m/s, highest recorded) 0 Hz to 125 Hz (at 96m/s, highest recorded)
Uncertainty Accuwind (Riso-R-1556) Classification:
  • Class 2.4A
  • Class 7.7B
    IEC 61400-12-1 operational standard uncertainty:
  • ± 0.14 m/s at 10 m/s for Class A
  • ± 0.45 m/s at 10 m/s for Class B
  • Refer to calibration sheet for information on calibration uncertainty
  • Refer to application note "#40C Anemometer Uncertainty" for definitions and more information
Accuwind (Riso-R-1556) Classification:
  • Class 2.4A
  • Class 7.7B
    IEC 61400-12-1 operational standard uncertainty:
  • ± 0.14 m/s at 10 m/s for Class A
  • ± 0.45 m/s at 10 m/s for Class B
  • refer to calibration sheet for information on calibration uncertainty
  • refer to application note "#40C Anemometer Uncertainty" for definitions and more information
Response characteristics  
Distance constant (63% recovery)
  • 2.55 m (8.37 feet) at 5m/s per ASTM D 5096-02
  • 2.56 m (8.40 feet) at 10m/s per ASTM D 5096-02
  • 2.55 m (8.37 feet) at 5m/s per ASTM D 5096-02
  • 2.56 m (8.40 feet) at 10m/s per ASTM D 5096-02
Moment of inertia
  • 1.01 x 10-4 kg-m2
  • 74.5 x 10-6 S-ft2
  • 1.01 x 10-4 kg-m2
  • 74.5 x 10-6 S-ft2
Swept diameter of rotor 190 mm (7.5 inches) 190 mm (7.5 inches)
Installation  
Mounting Onto a 13 mm (0.5") diameter mast with cotter pin and set screw Onto a 13 mm (0.5") diameter mast with cotter pin and set screw
Tools required 0.25 inch nut driver, petroleum jelly, electrical tape 0.25 inch nut driver, petroleum jelly, electrical tape
Environmental  
Operating temperature range -55 °C to 60 °C (-67 °F to 140 °F) -55 °C to 60 °C (-67 °F to 140 °F)
Operating humidity range 0 to 100% RH 0 to 100% RH
Physical  
Connections 4-40 brass hex nut/post terminals 4-40 brass hex nut/post terminals
Weight 0.14 kg (0.3 lbs) 0.14 kg (0.3 lbs)
Dimensions
  • 3 cups of conical cross-section, 51 mm (2") dia.
  • 81 mm (3.2") overall assembly height
  • 3 cups of conical cross-section, 51 mm (2") dia.
  • 81 mm (3.2") overall assembly height
Materials  
Cups One piece injection-molded black polycarbonate One piece injection-molded black polycarbonate
Body Housing is black ABS plastic Housing is black ABS plastic
Shaft Beryllium copper, fully hardened Beryllium copper, fully hardened
Bearing Modified Teflon, self-lubricating Modified Teflon, self-lubricating
Magnet Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
Coil Single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection Single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection
Boot Protective PVC sensor terminal boot included Protective PVC sensor terminal boot included
Terminals Brass Brass

Customer Service

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Boom Extensions

Boom Extensions

Extend and retrofit NRG booms to meet your project’s needs with our boom extensions and adapter kits.

Interface 40C to Logic Level, Speed Amp #892E

Interface 40C to Logic Level, Speed Amp #892E

Convert the 40C Anemometer from AC sine wave to square wave.

Interface #40 to Voltage, #SI5100

Interface #40 to Voltage, #SI5100

Interface the 40C Anemometer with an analog device such as a computer, meter, or recorder.

Symphonie® SCM Card

Symphonie® SCM Card

Condition your sensor’s output signal so that a SymphoniePLUS3 Data Logger can read it by installing a Symphonie Signal Conditioning Module (SCM).

Sensor Calibration Service

Sensor Calibration Service

Use these services to recalibrate anemometers available from NRG.

Sensor Cable Kit - 2C

Sensor Cable Kit - 2C

Use this two-conductor (2C) cable for unheated anemometers.

Sensor Terminal Boot

Sensor Terminal Boot

Protect your sensor terminal from exposure to the elements with a terminal boot.